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Effet catalytique de certains inorganiques sur la sélectivité des réactions de pyrolyse rapide de biomasses et de leurs constituants

Abstract : The fast primary pyrolysis of cellulose, lignin, xylan and birch wood (natural, reconstituted, washed or not) impregnated by different types of catalysts (KCl, MgCl2, NiCl2 and ZnCl2) is experimentally studied in an image furnace. The effect of a catalyst addition differs according to the type of biopolymer. However, the decrease of the liquids and the increase of the char production rates are always observed (the effects are more or less stressed according to the nature of the catalyst). The composition of the gaseous phase is also modified with an increase of the H2 volume fraction. The nature and morphology of chars depend on the type of catalyst. The quantity and composition of the intermediate liquid compound formed during the pyrolysis of cellulose are also modified. It's difficult to establish linear laws describing the pyrolytic behavior of biomasses from the simple overlapping of the observations made with basic biopolymers, implying the need of a modelling study. The model is based on mass and energy balances written at the level of biomasses pellets subjected to a given heat flux density. The agreement with the experimental results is quite good but suffers from a bad knowledge of the physicochemical properties of the biomasses. It is anticipated that the model could give better results if the influence of the interactions between basic biopolymers within the natural biomasses could be estimated and taken into account. Some researches in these domains could be recommended
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Maud Auber. Effet catalytique de certains inorganiques sur la sélectivité des réactions de pyrolyse rapide de biomasses et de leurs constituants. Autre. Institut National Polytechnique de Lorraine, 2009. Français. ⟨NNT : 2009INPL041N⟩. ⟨tel-01748719⟩

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